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Roll-bonded aluminium alloy diffusion couple in the as-rolled condition.

By University of Cambridge DoITPoMS and University of Cambridge Department of Materials Science and Metallurgy D T L Alexander


This micrograph shows the grain structure of a roll-bonded aluminium alloy diffusion couple in the as-rolled condition. The upper half of the couple is Al-0.5Fe-1.0Mn (wt.%), the lower half is Al-1.0Si (wt.%). Rolling heavily deforms the microstructure, producing thin, elongated grains parallel to the roll-bonded interface.The Barker's etch produces a thick oxide layer on the grains of aluminium (anodising). When viewed in cross-polarised light, interference in the oxide layer produces colours which depend on grain orientation, hence the grain structure is imaged. Prior to roll-bonding the Al-Si alloy was solution-treated, creating recrystallized grains that were much larger than the cellular microstructure of the Al-Fe-Mn alloy. This difference in scale of microstructure can be seen in the rolled diffusion couple.

Topics: alloy, aluminium, diffusion couple, metal, roll-bonding, doitpoms, university of cambridge, micrograph, corematerials, ukoer, Engineering, H000
Publisher: University of Cambridge
Year: 2010
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Provided by: Jorum Open
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